If your pinna doesn't affect the sound when wearing headphones like is does when you're listening to the world around you without headphones, then flattening the response of the phones with an EQ will not provide the desired effect. I imagine it's also possible not to get the desired effect if the EQ adversely alters the phase. Though many claims about sound quality as it relates to phase response seem a bit dubious to me, so I say this only tepidly.

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Breath is found in waveform and spectral plots;DR figures too, of course.